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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c4d34ff384c40c0b71d3c9ec07271a086a537b0541b4ad302ea4c462a6d4d9' 
  AND token = 'vxFW5+3oRQHrOFtReh0G/DhQt9KNuNkIV645oFA4k7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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