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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6906cd458d9d2e105d4ef41ce827f1fed5db6babccda2dad6a2c0f8fab904e5' 
  AND token = 'nUpHkBvIEEEY+GkEqbLkStj9qrERk3HR4JPUohXmYgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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