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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b319698d0f1b6ef3cfdfc2ac008c17fbeb98a23912d5a105f8cf13de0b4fe59' 
  AND token = 'aXjOtb/jUQwEVfj/NESXSNkZXAJXlQ5DVTe32n4obuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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