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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542a2cb01fe8a74d1f0882c6324188d3f07b45323ea637515315efa9ada23105' 
  AND token = '/xejcCupbXsmJIM1SG1ru7dHbYhvbDCRHnRjFHOJrnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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