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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcf8a3dfec78561be43e4c2de449882efd1c99db845ddca610f39ea8b80357e' 
  AND token = 'dw4cSVGsh6edp/ojVG+r7LSfpK0zHn77SUwSU+CKnkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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