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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0826e7317ab17ef07bbba2de1cf4c2e5235092cfd0466cffbb47f168551723bc' 
  AND token = 'G6biPdPVRJ/gUB1JhPQe4vPASXk3X7+6BBE96eJ13qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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