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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efce9ccb293d1664c00902c1ba3bc8b75bd411109b198d04bc05b67ffb95575c' 
  AND token = '1iRUPex6KatuKGKgdtbon72gQ6jCHEFuUQLQ/ZlgMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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