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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dbb470685ca51b261d5b8b9e8df6a6f52bb67268d80549df45e671ef3198ad' 
  AND token = '1tSy3hc38EeC3Hh2Bu6MWq3dL/kdyCvPNcUAd0wJtw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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