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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98574b828da1105d5e8cf2e63a3ebe34acd27b47ac80f5b11411694a140a4940' 
  AND token = 'Lqwy1g+xDnKzLfiud2byEg1B4JHdWHqzGR8trggIHy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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