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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d2f9c388b3e706849d2231f08ca482d568d3d60e963ed3dd83e33ccd1266ba' 
  AND token = 'SFYCVu05paQCSvVNeaiPc24SvTjfYj8/IGcEmNkk6uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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