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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe7fef7573c87b5e84c6d8754b97d4e7ca7079b6fe7c5c7df9a698d9f3b721a2' 
  AND token = 'akIegyb2Pi17qec2aeL5Qvx2mY/dMIFVufPpecTbTCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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