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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c434fc6d4f0e8c73e3d48a6be57a31174821ab95f07e99f7c6b2fe0d7d0bcbdc' 
  AND token = 'djhXBM83F3rZL+AdToi0z9ByrNz1Zko+hatpA8yuVIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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