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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d4c78ed6549e0b922ed275e0503e09c91bff6a6df94626ed93fcb3d0a1f5c6' 
  AND token = 'RODKJTmn2lgptPHVClTSAoww2LW4y2YMaEdWr8rQBhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}