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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5701efad1b990c9eef02c03d5085a28e773df0697b6eebaab8e56bab92714320' 
  AND token = '2WUu7s7g/rO3r8Uv2fE8aU4UNpHYsFbLnbn+GsBdTMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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