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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0464ff6b7f545ed13eb2cc6063a6812f0b20e92811a684170193f551bd002f25' 
  AND token = 'NgoLk1kvu1BzI40VnYFewxFrkL1Ip35TQlVTuHGY/Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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