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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070d7278e70148eb75dea52ab253ffbd759f50239774a9553d4af92dd2a0d83d' 
  AND token = 'd1KbPi68Qy3kf1L5LN6Jl7Lt9Th5fNlLkxGC+ofKrUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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