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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3153e908d882e43f99aa0550b71950d0bd85c9447aced8ef93398966218cc1' 
  AND token = 'Cn0pJc5Gv62HXh01dEeWTl8YUN7KGcoB/RHh2nD7Iec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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