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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96060213cd939392d0804bdc9e2d3f3eb4fbefb85b2d18334b2459522b869eb1' 
  AND token = '2HUSDRg3lIT6kn+R8D+i9oX7n0pxOxZv3QKidzW43Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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