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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e399179ca576a4c71898a27b82bc097ecd73feddaa7cfe715f5ded8ecf769adc' 
  AND token = 'Kb4M2mvvC+5GN+w+cn7loiVKEqsvzrOPu5EqUF0r3UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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