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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f510faf353e34c116291d27f38ca4855c05d7cc7b08344e52b6ef5f8a0b897' 
  AND token = '9EsEgLoANv6mZpN1Q7G8jlTxkw9UqObNeAXV0XFrquI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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