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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1537d2d5b125f1ca56870ffe9b4be3d7a4b1191f0f0581b5edf318f387f114' 
  AND token = '3isyeMY1AMYk9Y0/HI07RCorjLmzR/L52cUHl72cgp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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