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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ef9d9db7b351227a178d7bf93a0da49bd71b35b32e6818c61ed51a78613d02' 
  AND token = 'qKwvQk1DDec9O2PkZH74x0/66q5etfdL7zfK3XORWVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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