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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c678d0f681de6c6f505918e155955267ae068f553d2a5adb1a89b61c7034ead7' 
  AND token = 'bl4ZEykMRRSxpN0ekoUOYVnZPixN604Sa9c6cW/aV08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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