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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5431752b5901db6b5666f0ad18a0df24a5902d331c79a8935f9abb0871b210e0' 
  AND token = 'CQjbtqgwSnnKWM8cwkx8lJUHqHNTOkwi3u8D8dWToLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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