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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447720237108f69c77484414b91565b2456130806f1787be853da7376f9fb39e' 
  AND token = 'ZLEzWPtH2t3yfmYicU0DAWDl7n8RSySbNRTdyie2SD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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