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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ad43f0a7abab3e4069ec0883b50e14f1781a83c9d8b7aa1b9fd24532fd2e6a' 
  AND token = 'AW55Q2WiWBOv6rNxHNq5+bsAplLYXKwfH4LzH2TLMIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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