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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a0927afa581ef41c160e298e1af3cc42b877add37db6f76ae79a87f6da986a' 
  AND token = '7oIggHL8/5/H/zLwVy36zf1HPDX9Dz5U+O7XdB/vAVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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