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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5963882821722ef7095568421b0b0b565027ddac721727a97b43222f0c686ad4' 
  AND token = '9a/HQOreMqCbeBerd7vaxSS5bBirzY7bNGO3LWgo2mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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