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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0111c669e72c8100fa1dd8eeebe007219b7a3e729bb455d2f0e6aeeb17fbee5' 
  AND token = 'LaNvjjVjY1GyZSzwfrRmf+aUmk/qkp4uCy+VkwnONmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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