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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009320add0212e86b4b8ff8adc43738965a062ef9722fce7ec3e5163bb0dac59' 
  AND token = '39pXcbcfLc+p9ldePXchsBX+nizUQwI0S4zlkg+w3Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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