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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993a811ca2a8e300eeb368230a4f9d491c60062578b7e9343b6e88bff7c77025' 
  AND token = 'bHL6CQ5oCSQHbPjuosCTbcHW5VvP+spz6BDzLqqBRO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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