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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6172430c73453e1249cae8c0b6ef203a538f22fd3c3fc9f19987a723fee16a' 
  AND token = 'nZ/1R3WomCLN9z4MBviG4qL2iixCyhJZ8AUn8jipdmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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