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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7172e2866128f4e71827551907c33ff2093bda33eb19482f89a1a2eb5938238' 
  AND token = 'C+ey/rkS2UOPDIQtWA6QGfHxaNXF9uMHQ1MRYmdhMgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00230

JSON explain

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