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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f81c2d3bd3b84d1b8b6b60eab90b02d09da0df13ee19f4ccfad0ef85a0db88' 
  AND token = '02kgzhodxuNGso+cQA2KecSFqvlyhjdXfqt24Gtwxhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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