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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9723cd7133bc1d5a655100c810c8e1789c47e8a5e8138623e9f256bd77d53c2e' 
  AND token = 'yOdkk4C3DKpnTQgLraW5GT32xArhECj0ZQ0hnY+Vw+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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