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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1291b579b82e0bdd4819e0e1b713d3c01af6e5ba5c89768c756e8818071182e' 
  AND token = 'FprY1h7AvsVtZEkyxM0tGykWVVLRlTf2p8MEgNinJos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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