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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99c71bc7dd91b610624513aa855c9d2efeea26c45b903d006245d83acd4facc' 
  AND token = '6CXBsaB6R3NE/OMHoxIIHHl3Y0MlEQ2965wLSKihhG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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