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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46dfcb07262205809ea3dcaf3074fb94b23b86114e6f50be2b8f9b0b315d75a' 
  AND token = '58BJnav+s+4CUQIN6stvkbqJjE2S+QnWZr1LaitA+aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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