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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2944d947f75b27f148e68101fecc408386170879b26af1996f482cb6799c217d' 
  AND token = 'dGAJ0irHj1j60DiN+P/vIbnw5f5MulEkUah7gpN3j6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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