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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '378ec5223a353589285b78d723bb39dce330ade8f4ecd8758cd03140de3f80ed' 
  AND token = 'q3zYXuGH03xLfFYJVr3Y9FvTkhw1R5juPPWmvNZHxCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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