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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b70583f076ea5f8db0d2c1b4b50ce26c160aa41dbee14cd211e2841b3d0474e' 
  AND token = 'CGhjiq1S0w3Qi4t+yEqVu5/xO4ueikiMaw96gUisChg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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