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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74f27ceacc16a3b16c53ae7a4a5bfb25ce0933cf9ba6a421b7bf37253c3ad47' 
  AND token = 'hZPgZkbb5x4jWb099LsLj/Rb232NX+/T6S26yshWx0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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