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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb014e0dce6e3259962263087064c024e860e667cc792d9e7714dcbe8691314' 
  AND token = 'q7iimEbmWHKQGaDEduH13fnyLbU2r42k6Kh+2ey+yZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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