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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620c4c5952dbf2fee45095fff9b09618c956887df4a01dbe5986dbad2ffc7df4' 
  AND token = 'Mu+LOEx0AzTcCdo4IEzozfmIK5p+ayIX+PZi212jr28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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