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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd470f5fcdb6f7a17542279056324df96001fbd0a643dc7047a8e9d50344a70d5' 
  AND token = 'fMq5YABVDiqE+uutP+x79wwUyCqVE7foVX3JitX6c0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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