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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02a4abc781b5369417080f74e0000c4939b3a50ea34625b055be15c77a301c7' 
  AND token = 'NnmlHt3RsjG7pesKZuvopmjx9nMWT0U1kxUBnN4FQts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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