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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f761df5d5a53271bccc4c9c4aa979df1843dfdea8c83bf9937576e7701f4d15' 
  AND token = 'EtT4ZNNjgRbfLp35C7s3qef4d8aDzLHLEaEs4TINhxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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