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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdd55675cf414aae92f76e618ce2bd81a0297d9381e90fe3ee83c6bf83c069f2' 
  AND token = 'a3X9FqdQP2tM75+jObbT+N5J6w8DYN8y9e+hEsRiShM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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