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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfee96a941aa24dfb31a21882f37111ad90e7a3f01e751a8e3c11045fbb8f77' 
  AND token = '3/X0PMJ72jfdWq64mECmy48qo1QMH6pH3BiqHOfoBJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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