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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076d77e11299a0b4ddcc5faaffd271bef9f2c64d40344127188dc445e3e14e8b' 
  AND token = '9Od6xCYf4ltSTcl/eZjYUFhNKKWWpXm3hosaszS19vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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