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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1494d40c9c24e65f84edf801f11741a0a169d129033427e471bb237dad9ec9a4' 
  AND token = 'OWAfD2hoMdk9Roud7B85VScw9bAy3nNmwcgqZ47N3WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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