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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304aedd5742ef3fdb389510f766e30a065c56f466bf9b2b2fa23d00f376aa731' 
  AND token = 'F849r3OSvV4lHupZT6La1aYgnQDburhkCL8kAeyZaBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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