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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bd22b7a3c767e35c72bb5c7f1b6696c9ff4fc025b1b635c75cddd1402e4d93' 
  AND token = '4KN2a1kHUPBk62763s+30OHreQth8vM27MF8B0R9na4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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