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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a897310f7f768cc0cc933fed068c3ca1f2c68150f46537b74d2b406911147b' 
  AND token = 'kPUC/mOwh+G1V1HC1DluZA/MlSA2WaUJkn7mVN0rbmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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