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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d1630982a777044bdbfc4389696e8735f7f5b32bd3ce06fcd5073ca08ae6062' 
  AND token = 't5gaxVm65vfOEwMbbemiKm6aaJnEAx++aG+/T76cVmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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