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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f05a7d5826f2aa163d0ec3e8eb4e6cc06f1f94b19a17f0d6b0a5fca012ec158' 
  AND token = 'k9PuUg+xpL32OiXGSc8x4HnXZX//WJnIsZOZDP8KCg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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