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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f12373e3e7b33d473fc4861a114f35ec8e808dcd90d035dc3c396f19490f97fa' 
  AND token = 'MT1M9qwnL5jLopFrBNqwZde8hfBR2R0jYmB8HFstvMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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