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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59b248aab362810df795f0904997bb92682afead0b80eb4bd0c8edae328c6f95' 
  AND token = 'KRRIzWan80G8sfShpQa4lo6THC6IIVi2ppXO+Tc8NEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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